Sometimes users face system performance issue after installing Bullguard Antivirus. You can boost the performance of your PC by defragmenting the hard disk. Go to START button and then select Programs, after that click on Accessories and then System tools. There you need to tap on Disk Defragmenter; this will start Microsoft Disk Defragmenter, then click on the button defragment now. Select the file which you want to defragment and then click OK. Wait till the process gets complete. To know more about Bullguard antivirus please dial 0808-101-2159 Bullguard Phone Number UK.